A sapphire and diamond ring, circa 1920. Photo courtesy Bonhams

Of shield design, the triangular-shaped sapphire, weighing 4.52 carats, within a baguette, triangular and brilliant-cut diamond surround, diamonds approximately 1.25 carats total, ring size 5. Estimate: HK$ 156,000 - 234,000 (€15,000 - 22,000) ($20,000 – $30,000)

Accompanied by a SSEF Swiss Gemmological Institute report stating that the natural sapphire has no indications of heat treatment and originates from Sri Lanka (Ceylon). Report number 66371, dated 15 January 2013.

Bonhams. FINE JEWELLERY & JADEITE. Hong Kong. 23 Nov 2013 14:00 CST - http://www.bonhams.com